The service plug is developed to plug hoses or rigid pipes to avoid oils and chemicals from contaminating the environment and to preserve costly oils and liquids inside systems during maintenance and repair. It can also be used to protect machine channels from dust and corrosion when cleaning or painting, to prevent water, paint, dust, and pollution from harming system and components. For use in non-pressurized and vacuum systems. Made of high-quality oil-resistance rubber. No tools needed! Use your hands to insert, push, then push and twist in the same action. The plug can be cut to adjust sizing.